Re: [PATCH v9 4/7] tracepoint: Make rcuidle tracepoint callers use SRCU

On Thu, Jun 28, 2018 at 11:21:46AM -0700, Joel Fernandes wrote:

• it_func_ptr = rcu_dereference_sched((tp)->funcs);	\
  

I would convert to rcu_dereference_raw() to appease sparse. The fancy stuff below is pointless if you then turn off all checking.

• 							\
  

• /*							\
  

•  * For rcuidle callers, use srcu since sched-rcu	\
  

•  * doesn't work from the idle path.			\
  

•  */							\
  

• if (rcuidle) {						\
  

• 	if (in_nmi()) {					\
  

• 		WARN_ON_ONCE(1);			\
  

• 		return; /* no srcu from nmi */		\
  

• 	}						\
  

• 							\
  

• 	idx = srcu_read_lock_notrace(&tracepoint_srcu);	\
  

• 	it_func_ptr =					\
  

• 		srcu_dereference_notrace((tp)->funcs,	\
  

• 				&tracepoint_srcu);	\
  

• 	/* To keep it consistent with !rcuidle path */	\
  

• 	preempt_disable_notrace();			\
  

• } else {						\
  

• 	rcu_read_lock_sched_notrace();			\
  

• 	it_func_ptr =					\
  

• 		rcu_dereference_sched((tp)->funcs);	\
  

• }							\
  

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